geologic time links

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http://www.ck12.org/user:ZGR3eWVyQGdkcnNkLm9yZw../book/Geologic-Time-Flex-book/r1

http://www.geosociety.org/science/timescale/timescl.pdf

http://www.ucmp.berkeley.edu/help/timeform.html

http://www.enchantedlearning.com/subjects/Geologictime.html

http://pubs.usgs.gov/gip/geotime/divisions.html

http://paleobiology.si.edu/geotime/main/index.html

http://www.newworldencyclopedia.org/entry/Geologic_time_scale